Method and system for multi-port synchronous high voltage testing

ABSTRACT

The invention disclosed a method and system for multi-port synchronous high voltage testing, which mainly uses two or more sets of testing circuit with variable output condition and a high voltage generator with zero intermediate voltage for synchronous high voltage testing. Therefore it is not only possible to prevent operators from electric shock but also to provide correct multi-port testing voltages so as not to cause object under test damage. The testing circuit uses a plurality sets of individual high voltage generator and a current detector for providing functions for reading and determining individual voltage and current, so that it is possible to perform several high voltage tests during a single test period and complete tests on electric products. It is therefore possible to achieve both reduction of test-time and safety of operators.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a method and system for multi-portsynchronous high voltage testing, especially to a method and systemusing two or more independent high voltage generator to performmulti-port high voltage testing on an object under test.

2. Description of the Prior Art

Refer to FIG. 1, FIG. 1 is a block diagram showing a conventional testsystem for multi-port high voltage scanning, which comprises a highvoltage generator 12 and a current detector 13. At present, whenmanufacturers perform a high voltage testing on electric parts orproducts, if the object has a primary portion 21, a case 22, andsecondary portion 23, wherein the potentials of the secondary portion 23and the case 22 are different, the primary portion 21 will be requestedto be tested in high voltage to the secondary portion 23, high voltageturned out at floated case 22 frequently put operators under risk ofelectric shock by exposure to case 22. At the same time, the floatingvoltage of case 22 resulted from the voltage division effect of internalimpedances for the primary portion-to-case and the case-to-secondaryportion frequently cause electric products damage due to poor withstandvoltage caused by the different designing conditions.

Furthermore, the conventional multi-port high voltage scanning testsystem 1 needs to use high voltage switching circuit 11 to perform highvoltage testing of the primary portion-to-case, the secondaryportion-to-case, and the primary portion to the secondary portion.Therefore, at least three tests are necessary to complete tests onobjects under test, the total test is difficult to control total testtime required.

Seeing the inefficiency of testing via conventional system awaitingurgent improvement, the inventor has invested prolong thinking andresearch effort on the subject and finally developed the method andsystem for multi-port synchronous high voltage testing.

SUMMARY OF THE INVENTION

An object of present invention is to provide a method and system formulti-port synchronous high voltage testing, so that it is possible toprevent operators from electric shock caused by unintentionally touchingfloating ground of the tested object during high voltage testing and toensure the safety of the operator. Another object of present inventionis to provide a method and system for multi-port synchronous highvoltage testing, so that it is possible to prevent the electric productfrom poor withstand voltage caused by voltage division effect ofconditional voltage distribution during a floating test.

Yet another object of present invention is to provide a method andsystem for multi-port synchronous high voltage testing, so that it ispossible to complete a three-time high voltage testing in a single testperiod via a synchronous testing, and the test time is effectivelyreduced to one third of that required in prior art.

A method and system for multi-port synchronous high voltage testing,which mainly uses two or more sets of testing circuit with variableoutput condition and a high voltage generator with zero intermediatevoltage for synchronous high voltage testing, wherein said testingcircuit comprises a plurality sets of individual high voltage generatorand a current detector for providing functions for reading anddetermining individual voltage and current, so that it is possible toperform several high voltage tests during a single test period andcomplete the product test.

DETAILED DESCRIPTION OF THE INVENTION

Refer to FIG. 2, FIG. 2 is a block diagram showing a circuit formulti-port synchronous high voltage testing 3 according to the presentinvention. The present invention uses two independent sets of highvoltage generator as voltage controlling output devices, wherein theintermediate voltage between high voltage generator A 31 and currentdetector A 32 and between high voltage generator B 34 and currentdetector B 35 are of compulsory zero-volt, so that it is possible toensure the safety of operators. In AC mode, said two independent sets ofhigh voltage generator have a feature of independently and individuallycontrolled voltage magnitude and opposite phases, i.e. a phasedifference of 180 degree; while in DC mode, said two independent sets ofhigh voltage generator have a feature of independently and individuallycontrolled voltage magnitudes and positive and negative voltage outputsrespectively, i.e. one voltage with polarity opposite to the other.

In order to improve consecutive multi-time testing in prior art forsimultaneous multi-port testing, the present invention has change of theoutput conditions: a primary loop with independent voltage V1 consistedof a high voltage generator A 31, a current detector A 32, and a primaryportion 33 of object under test; a secondary loop with independentvoltage V2 consisted of a high voltage generator B 34, a currentdetector B 35, and a secondary portion 36 of object under test; azero-potential loop with independent voltage V3 which is a loop fromproduct case 37 to zero-potential(intermediate voltage); such thatexcept the function of the high voltage generator, in AC mode, thecurrent detector detects current flow through object under test, due tohigh voltage generator A 31 and high voltage generator B 34 opposite inphase, the current detector synchronously detect current flow from highvoltage generator B 34 via object under test to high voltage generator A31, thus in case of having independent voltage in each loop, bothcurrent reading and determining may fulfill the safety specification intests request for independent voltage and current reading anddetermination.

Therefore as described above, when performing high voltage testing onelectric parts or products equipped with primary portion, case, andsecondary portion for the secondary portion and the case of differentpotentials, said circuit may complete three high voltage testing ofprimary-to-case, secondary-to-case, and primary-to-secondary on electricproduct or tested object within a single test period.

For further emphasize, said testing circuit uses a plurality sets ofhigh voltage generators and a current detector to provide functions forreading and determining of independent voltage and current, so as toperform several high voltage tests during a single test period, whilereducing test time and protecting operators.

FEATURS AND EFFECTS

The present invention has provided a circuit for multi-port synchronoushigh voltage testing with the following advantages:

1. To ensure that tested product has no poor withstand voltage caused byvoltage division.

2. To effectively save test time for manufacturer seriously aboutshipment schedule to have absolute controllability.

3. To provide a technique that is not familiar to those skilled in priorart but very inventive.

To summary from above, the present invention is an unpublic noveltechnique with industry applicability and improvement, which can complywith the criteria specification of patent law.

However, above mentioned is simply a preferred embodiment that is notintended to be the limit of the invention, and various change,equivalence and modification without departing from the claim must beconsidered within the scope and spirit of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a block diagram showing a conventional circuit for highvoltage testing.

FIG. 2 is a block diagram showing a circuit for multi-port synchronoushigh voltage testing in accordance with present invention.

DESCRIPTION OF SYMBOL

1 conventional circuit for multi-port scanning system of high voltagetesting

3 circuit for multi-port synchronous high voltage testing

11 high voltage switching circuit

12 high voltage generator

13 current detector

21 primary portion

22 case

23 secondary portion

31 high voltage generator A

32 current detector A

33 primary portion

34 high voltage generator B

35 current detector B

36 secondary portion

37 product case

What we claimed is:
 1. A circuit for multi-port synchronous high voltagetesting, comprising: a primary loop, composed of a high voltagegenerator, a current detector, and a primary portion of a tested objectfor providing an independent voltage V1; a secondary loop, composed of ahigh voltage generator, a current detector, and a secondary portion ofthe tested object for providing an independent voltage V2; azero-potential loop, which is a loop from product case to intermediatevoltage; wherein by using a formation of each said loops tosynchronously provide three high voltage testing on primary-to-case,secondary-to-case, and primary-to-secondary, and complete currenttesting with the safety specification fulfilled.
 2. The circuit formulti-port synchronous high voltage testing according to claim 1,wherein said two independent sets of high voltage generators have in ACmode a feature of independently and individually controlled voltagemagnitudes and opposite phases, i.e. a phase difference of 180 degree.3. The circuit for multi-port synchronous high voltage testing accordingto claim 1, wherein said two independent sets of high voltage generatorhave in DC mode a feature of independently and individually controlledvoltage magnitude and positive and negative voltage output respectively,i.e. one voltage with opposite polarity to the other.
 4. The circuit formulti-port synchronous high voltage testing according to claim 1,wherein said current detector detects a current flow through the testedobject, due to said high voltage generator (A31) and said high voltagegenerator (B34) opposite in phase, said current detector simultaneouslydetects current flow from said high voltage generator (B34) to said highvoltage generator (A31) via the tested object.
 5. The circuit formulti-port synchronous high voltage testing according to claim 1,wherein in case of having independent voltage in each loop, both currentreading and determination can fulfil the safety specification in testsrequest for independent voltage and current reading and determination.6. A method for multi-port synchronous high voltage testing,characterized in that: providing an independent voltage (V1) across aprimary loop consisting of a high voltage generator (A 31), a currentdetector (A32), and a primary portion (33) of a tested object; providingan independent voltage (V2) across a secondary loop consisting of a highvoltage generator (B 34), a current detector (B 35), and a secondaryportion (36) of the tested object; providing an independent voltage (V3)across a zero-potential loop which is a loop from a product case (37) tozero-potential, whereby, having independent voltage in each loop, theformation of each said loops synchronously provide three high voltagetesting on primary-to-case, secondary-to-case, and primary-to-secondary;and completing current testing so that a safety specification isfulfilled.